pracy



To all whom it 'ma/y concern.-

dnted 51am @sind (twine.

GEORGE T. PRACY, OE' sAN FRANCISCO, CALIFORNIA.

l l I Letters Patent No. 85,7 63, dated January 12, 1869.

The Schedule referred to in these Letters Patent and making part of the sama.

Be it known that I, GEORGE T. PRACY, ofthe city and county of San Franciscmstate of California, have invented an Improved Governor for Steam Engines; and

lI do hereby declare the following description and accompanying drawings are sufficient to enableany person skilled in the art or science to which it mostv nearly appertains, to make and use my said invention or improvements without further invention or experiment. The object of my invention is to provide an improved governor for steam-engines, which is so constructed that it will act instantaneously on vthe `gov ernor-valves Whenever the speed of the engine is checked or increased, andby means of a device which is very simple and cheap compared with other governors.

To eect this, I construct the governor with two arms, each composed of two rods, which are attached to the valve-spindle at the top, and forming a knucklejoint at the centre, at which point the weights are placed. v

At the bottom, the two lower rods have each a curved projecting lug, the end of which rests on a rubber or other spring, so that as the weights separate by centrifugal motion, the springs are compressed but if ,the

A is a standard, having the valve-spindle B passing down through it, and operating on the valve.

The upper end of the spindle is so connected with y the sleeve O, that any motion that it makes up or down carries the spindle with it.

The two arms D D are hinged to the'lugs E, vand are hinged to the two arms F, so as to form a knucklejoint at a.

The two arms F are hinged at the bottom to'th short lugs or arms G, on the revolving sleeve I; and

the weights H H are attached at the junction a of the .arms D and F.

From the outside of the arms F, near their point of attachment at the bottom, two'curved arms, L, project, so that their ends rest on the plungers M.

These plungers are fitted into the pots J, so as-,to

rest on and move `with the springs, and at thel same" time protect them from all dirt.

The sleeve I is revolved by the bevelled gear N, and carries with it the pots J and the arms F and D, with the weights I-I H.

As the speed increases, the weights separate bycentrifugal force, and operate on the valve by the spindle B, so as to close it more or less, accordingto-the speed. As the weights separate, the curved lugso'r arms L press on the plungers M, and compress the springs K, the resistance increasing with the amount of compression, and whenever the speed is abated, the springs, by their elasticity, act instantaneously on the lugs, and through them on the arms F and the weights H, thus forcing them back to the centre, and'opening the valve.

I do not conne myself to any particular position of the springs, as they might be attached to the upper part, and be operatedby lugs on the arms D, but it is not as convenient.

By this construction I form a very simple and extremely delicate governor, without expensive springs, as they may be made of a short length of rubber pipe, which can be removed at any time in a few moments.

Having thus described my invention,

W hat I claim, and desire to secure by Letters Patent, is-L The cups J, springs K, arms F, and lugs L, combined and arranged substantially as described, for the purpose specified.

In witness whereof, I have hereunto set my hand and seal.

Witnesses: GEORGE T. PRAGY. [L. S.]

J. L. BOONE, GEO. H. STRONG. 

